山西大同盆地震源机制解矛盾符号比及波速比变化的研究
|
摘要
选用山西地区 1990年至 2 0 0 1年 12 a的地震资料 ,采用格点尝试法、和达法分别计算了山西大同盆地震源机制解的各有关参数及平均波速比 ,探讨了该区震源机制解各参数及平均波速比在中强震前后的变化规律 ,得出山西大同盆地震源机制解矛盾符号比及波速比在主压应力 P轴取向稳定的条件下同步降低的负异常 ,与该区中强地震有一定的对应关系的结论。
Based on the seismic data of Shanxi from year 1990 to 2001, the source mechanism solution and the average ratio of wave velocity for Datong basin are worked out by using trial and error procedure on a grid and Wadati diagram,respectively. From variation in source mechanism solution and the average ratio of wave velocity before and after earthquakes, we conclude that under condition of unchanged direction of principle pressure stress P axis , the ratio of inconsistent onset polarity in source mechanism solution and the ratio of wave velocity for Datong basin decline synchronously as the negative anomalies ,which correspond to medium-strong earthquakes in the region more or less.
Based on the seismic data of Shanxi from year 1990 to 2001, the source mechanism solution and the average ratio of wave velocity for Datong basin are worked out by using trial and error procedure on a grid and Wadati diagram,respectively. From variation in source mechanism solution and the average ratio of wave velocity before and after earthquakes, we conclude that under condition of unchanged direction of principle pressure stress P axis , the ratio of inconsistent onset polarity in source mechanism solution and the ratio of wave velocity for Datong basin decline synchronously as the negative anomalies ,which correspond to medium-strong earthquakes in the region more or less.
引文
[1] 冯益德.地震波速比异常[M].北京:地震出版社,1981.
[2] 刁桂苓,于新昌.关于强震前后断层面解参数变化的讨论[J].华北地震科学,1984,2(2):70-73.
[3] 刘 巍,赵新平,安卫平,等.山西地区的震源机制解结果[J].山西地震,1993(2):7-12.
[4] 刘继禄,李雪英,阎瑞贞,等.大同-阳高地震前后地震波速比在源区与场区的变化特征[J].山西地震,1999(2):10-14.
[5] 黄蓉良.首都圈地区的波速比异常及地震预测[J].地震地磁观测与研究,1999,20(1):82-86.
[2] 刁桂苓,于新昌.关于强震前后断层面解参数变化的讨论[J].华北地震科学,1984,2(2):70-73.
[3] 刘 巍,赵新平,安卫平,等.山西地区的震源机制解结果[J].山西地震,1993(2):7-12.
[4] 刘继禄,李雪英,阎瑞贞,等.大同-阳高地震前后地震波速比在源区与场区的变化特征[J].山西地震,1999(2):10-14.
[5] 黄蓉良.首都圈地区的波速比异常及地震预测[J].地震地磁观测与研究,1999,20(1):82-86.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心